Pull shovel



P. BURKE PULL sHovEL Nov. 17, 1925- F'iled Aug. 2, 1924 3 Sheets-Sheet 1 ATTORNEYS.

P. BURKE Nov. 17, 1925.

PULL SHOVEL 3 Sheets-Sheet 2 Filed Aug. 2, 1924 INVENTOR.

.-lTToRNEYJ P. BURKE Nov. 17, 1925.

PULL SHOVEL 3 Sheet-Sheet 5 FilenAug. 2 N

Patented Nov. 17, 1925.

UNITED isTaTEs PATENT OFFICE.

PAUL BURKE, OF vGREEN BAY, WISCONSIN, ASSIGNOR TO NORTHWEST ENGINEERING COMPANY, OF GREEN BAY, WISCONSIN, A CORPORATION OF WISCONSIN.`

PULL SHOVEL.

Application led August 2, 1924. Serial No. 729,734.

To all whom it may concern Be it known that I, PAUL Bumm, a citizen of the United States of America, and resident of Green Bay, in the county of Brown and State of Wisconsin, have invented new and useful Improvements in Pull Shovels, of which the following is a description, reference being had to the accompanyinigl drawings which are a part of this speci cation.

he invent-ion relates to excavating machines, and more particularly to shoveling machines of the type in which the shovel or dipper is pulled toward the machine during digging, machines of this type being generally employed for di ging ditches.

The general object of t e invention is to improve upon existing designs of machines of this type by the provision of a. box-boom; by so shaping .this boom as to provide for a wider range `of work as compared to a straight boom ot' the same length; by so shaping the end of this boom as to permit the dipper stick to swing outwardly to an extended discharging position in a more efiicient manner than heretofore; and, by associating with the boom an auxiliary frame operatively connected with the dragline under certain conditions of operation to use the tension in the drag-cable to prevent excessive crowding.

The invention further consists in the several features hereinafter set forth and more particularly defined by claims at the conclusion hereof.

In the drawings: Fig. 1 is an elevation view of a machine embodying the invention, showing the dragline reeved in one way;

Fig. 2 is a detail plan view of a part of the boom and the dragline arrangement shown in Fig. 1:

Fig. 3 is an elevation view of a machine embodying the invention, showing the dragline reeved in another way;

Fig. 4 is a detail plan view of a part ot' the boom and the dragline arrangement shown in Fig. 3;

Fig. 5 is a detail elevation view of the digging mechanism;

Fig. 6 is an end view, partly in section, of the auxiliary frame:

Fig. 7 is an enlarged detail plan view of a medial part of the boom;

Fig. 8 1s a detail plan view of the upper end of the dipper stick;

forked inner end to a hinge-pin 13 supported on a bracket 14 secured to the rotating base 15 of the machine, which base is of wellknown construction and mounted on the travelling base 16 of the machine. 4 A primemover 17 is mounted on the base 15 and through suitable `transmission mechanism drives the propelling treads 18 and actuates the dragline drum 19 and the hoisting drum 20. The drums 19 and 20 may be of any suitable construction equipped with clutches and brakes to control their operation, and as shown are axially alined with each other.

The boom 12 is of box form. A By that I mean that both side members 12 are braced rigidly one to the other, there being no intervening division for the assage of the cable or other member theret rough, though they lower forked end is not fully enclosed, as in the main portion, a section of which main portion is shown in Fig. 11. In actual service the boom of this type of machine is subjected to severe torsional stresses arising from eccentric loads on the dipper-lipl or teeth when the digging force isl vapplied more forcibly to one side than `t ,f the"gother of the dipper-lip or teeth, and the`boxboom efficiently withstands such stresses. By the term box-boom I mean a boom in which one side of the boom is braced rigidly tothe other side Without an intervening slot or channel for the passage of cable.

The boom itself is of .cambered form in thatfits outer end portion 21 extends downwardly from the general plane of the rear part of the boom, and what may be termed the tip portion 22 of the portion 21 extends upwardly from the main part of this end portion and carries the pivot-pin 23 for the dipper handle 24. This, itv will be observed, has the eli'ect of laterally offsetting the pin 23 below the rear portion of the l'las i to , said rods being he tive tothe bracket `14 en .said

v lidler sheave 4 5 associated therewith"and car-y boom with the decidedly advantageous result of increasing the digging range of the dipper 25, and the upwardly extending tip permits the dipper handle 24 to swing outwardly the desired amount without interfering with the boom. v

The dipper handle 24 has a bracket portion 26 through which the pivot in 23 passes, and the dipper is preferab substantially rigidly connected to the ipper handle by a pin 27 forming a connection between the lower end of the handle and the rear end of the dipper and by a brace or braces 28 inned to the forward end of wthe dipper an the bracket 26. The dip er may be of any suitable construction an is usually provided with digging teeth 28. Chains 29 connected to the si es of the dipper each connect with an arm 30 on the dragline sheave block 31 which is disposed flatwise instead of edgewise.

The upper end of the dipper handle carries a pin 32 and sheave-blocks 33 are d1- rectly pivotally mounted on this pln on opposite sides of the handle, see F1 8, or the sheaves themselves may be journa led on .thls pin, as shown in Fig. 12. The extreme 1nward swin ing movement of the u per end of the han le is limited by the han les contact with a stop-block34 on the outer end of the boom. i

A main frame 35, of any suitable construction, on the rotating base cooperates with an auxiliary frame 36 to support the boom 12 and the digging mechanism associated therewith.

This auxiliary frame 36 is in the form of a box-girder with its lower end 36 mounted on the hinge-pin 13 and its upper end provided with a forked casting 37 carrying a shaft 38 upon which pulleys 39 are oosely mounted, said pulleys being connected wit ulleys 40 on the mainframe by suitable cables 41 whereby the position of the frame 36 relative to the main frame and operative connection therewith is effected. The upper end of this frame 36 is braced against lat eral stresses by adjustable tension braces or rods 42 connecting opposite sides of the casting 37 to the pin 13, the lower ends 0f d in spaced position relaby suitable spacers 43 A gu1de-sheave'44 for the hoistg'line is loosely mounted on the shaft 38 and has an ried by arms loose on said shaft. The

frame 36 alsollfa's brackets 47 carrying a the dragline is iounted.

The boom at its inner end has a fleeting or shaft v48 upon'which a lifting-sheave 49 forv guide-sheave 50 mounted on a shaft 50on brackets 50 on the boom with which a fairlead roller 51 on the in 13 cooperates.' A- sheave 52, exterior o the boom, is loosely Lacasse mounted on a shaft 52 carried by the boom, and sheaves 53 and 54 are mountedon opposite sides of the boom on a shaft 55 extending through the boom. The boom is also provided with handhole openings 56 in its side and similar openings 57 in the web or brace plates 58 adjacent the shafts 52 and 55 for assembly purposes.

The forked portion of the casting 37 oppo? site the sheave 44 has a segmented cableguide-groove 59 over which the dead-end side of the hoisting cable 60 passes.

A hoisting rope sheave-block- 61 is pivoted to a bridle 62 loosely mounted on the shaft 38, said sheave being disposed latwise relative to its arc of swin ing.

The hoisting rope or ca le 60 is secured to and passes from the hoisting drum 20 over the sheave 44, thence around the sheave of the sheave-block 33 on the left -hand side of the dipper handle 24, thence rearwardly and around the sheave of the sheave-block 61, thence forwardly and around the sheave of the sheave-block 33 on the right hand side of the dipper handle, thence rearwardly over the groove 59 and is dead-ended at 63 on the frame 35 of the machine. With this reeving it will be noted that the hoisting cable is used to raiseand lower the boom and at the same time cause a swinging of the dipper handle relative to the boom.

The dragline 64 is secured to and passes from the drum 19 under the sheave 50 and over the sheaves 52 and 53 around the padlock sheave 31, thence over the sheave 54 and, in the arrangement shown in Figs. land 2, is then dead-ended directly on the boom, as at 65. In the arrangement shown in Figs. 3 and 4 the dragline, after passing over the sheave 54, passes upwardly over the sheave 49 on the frame 36 and then downwardly to a dead-end point 66 on the boom.

It will be noted from the foregoing that the drag-line straddles the boom and has a two-part-line connection with the dipper v of the boom 12 and the swinging of the dipper 25 relative to the boom, either separatel; or in conjunction with the movement of t e boom through the roper manipulation of the hoist-line60 and) the dragline 64.

- Th1' 1 s`;" in the construction shown in Fig. v1, the-,digging operation is effected by the paying" out of thehoisting line 60 to lower the boom and swing the dipper 25 outwardly to the digging position shown in full lines, after which the pulling in of the dragline 64 and the gradual release of the hoist-line 60 cause the dipper 25to swing about the lpivot 23 to effect the dig ing operation, as'shown in dotted lines in t is figure. The advantages of the crooked or cambered boom are also apparent from this drawing4 because if the boom between the points 12 and-23 were straight it will be noted that it would come into contact with the unexcavatedmaterial and that as a consequence the dipper 25 could not work at the depth shown. Thus, one of the advantages of this boom is that for a given position of the lower end of the boom, the o'set adds materially to the permissible digging depth. Furthermore, if the boom were straight the dipper could no t be swung upwardly toward the boom as far as shown because the padlock sheave 31 would contact with the bottom of a straight boom before the dip er ever reached the u er dotted-line digging position shown in course, limit the digging range of the machine. Thus, the crooked boom'not only permits the dipper working at a greater depth but through a greater range than is ssible with a straight boom. As a shovel, it will be understood that the height'of the bank or the length of the sweep of the dipper through the material frequently has a controlling effect upon the completeness with which the dipper fills and, therefore, the greater freedom of' dipper movement which the cambered boom affords is a marked advantage over the usual straight boom type of machine.

From the filled dotted-line position shown in Fig. 1 the dipper is discharged by holding the dragline 64 through the braking of the drag drum 79, then raising the boom by the pulling in on the hoist-.line until the dipper clears the bank and then swinging the boom by the turning of the base 15 until the dipper is over the spoil bank at which time the, dragline 64 is released or payed out and the weight of the dipper and its contents then swings the dipper outwardly to the discharge position shown in dotted lines in Fig. 1 in connection with the raised boom. As the dipper on discharging swings outwardly with considerable velocity, the upward yrise due to the tip 22 gives the upper end of the dipper stick sulicient clearance relative to the boom to permit this swinging action without battering the boom. The stop-block 34 on the boom also limits the extreme inward swing of the upper end of the dipper handle relative to the boom.

As ordinarily employed, the drag cable is dead-ended directly on the boom, as shown in Figs. 1 and 2. In cases of extremely soft material, however, the weight of the boom and di per is liable to cause excessive crowding o? the dipper into the material, thus causing a burying effect which, at times, is great enough to increase the resistance ig. 1, which would, of

in pulling the dipper through the material to an amount greater than the power plant can adequately handle. If the dra cable is led back to the machine proper, t ere will be a lifting moment exerted upon the boom equal to the tension in the cable, multiplied by the lengthv of the the line of the drag ca le and the boom hin eI 13. This moment can be substantial y doubled by passing the drag cable around a sheave joui-nalled on the machine pro' er, as the sheave 49 on the frame 36 and t en dead-ending the cable on the boom, as at 66, shown in Figs. 3 and 4, so that not only does the drag cable swing the dipperabout the boom during digging but also tends to lift the dipper and boom.

For shallow' digging it is desirable to have the drag cable sheavesI farther away from the dipper than the best point for deep digging and this is accomplished in the present machine by changing the location of the shaft 55 for the coaxial sheaves perpendicular between 53 and 54 from its position shown in Fig.

form or arrangement of parts except in so far as such limitations are specified in the claims vor necessitated by the prior art.

What I claim as my invention is:

1. In an excavating machine of the type described, the combination with a support, of a boom pivoted thereon, a dipper and dipper handle pivotally carried at the outer end portion of said boom and swinging toward the same during digging, and cables for controlling the movements of the boom, dipper and dipper handle, said boom being cambered to increase the Working range of the dipper.

2. In an excavating machine of the type described, the combination of a support, of a boom pivoted thereon, a dipper and Adipper handle pivotally carriedat the outer end portion of said boom and swinging toward the same during digging, and cables for controlling the movements of the boom, dipper and dipper handle, the 'outer end portion of the boom extending downwardly from the main portion of the boom1 to offset the point of pivotal connection of the dipper handle below themain portion of the boom to increase the working range of the dipper.

3. In an excavating machine of the pullshovel type in which the dipper and dipper handle are pivoted to the outer end ortion of the swinging boom, the improve boom having its outer end portion inclined downf and its-tip portion carrym dle pivot extending upwar y part of said inclined outer portion whereby jY .charging position withoutmterfermg withv if '1o.

of a boom pivoted thereon, a dip r an wardly from the main 'portion offthe l thefdi r hany fromptlzle main the working range of the dipper .is increased andthe dipper handle may'swin to disthe shoveltype, thecombmation with a supiirt,

P- per handle pivotallycarried at t e outer end portion of the boom, al padlock sheave connected to the dipper, vaA 'dragline passing around Asaid sheave` andhavmg lts parts straddling the boom, guide sheavesexterior :of and carried by the boom, for said dragline, means for operatin said d ra line, and means for raising and owering t e boom.

, '5. In anexcavatin machine of the `pull-v` shovel tygg, the comblnation with a support,

of a boxm pivoted thereon, a. dipper and dipper handle pivotally carried at the \outer end. portion of the boom, a padlock sheave connected tothe dipper, a dragline passing around said ysheave and having its parts straddling the boom, guide sheaves, exterior of and carriedI by the boom, for said dragline, means for ,operatingl Said dragline,

sheaves having their supporting blocks pivoted directly to opiliosite sides of the uperl andle, le

end of the di r a hoisting ca having a mu ti-part hoist line connectionv with eachof said last-named sheaves, and means for operating said hoisting cable.

6. In an excavatlng machineof the pullshovel type, the combination with a sup- Kort, of a boom pivoted thereon, a dipper handle, a frame on said sup ndle pivoted` intermediate its ends on the outer end portion of the boom, a dipperjon vthe lower Aend of said handle, sheaves on opposite sides of the upper end of the dipper rt,1a sheave carried by lsaid frame, a hoisting cable having a multi-part hoist line connection with each of the sheaves on the dipper handle and with the sheave on `said frame,

for operating said hoisting cable;

7. n an excavati' machine of thejpull-l shovel type, the combination with a support,

of a box-boom pivoted thereon, a dipper handle pivoted intermediate its ends on vthe outer end portion of the boom, a` dipper on the lower end of said handle, va adlock sheave connected to the dipper and isposed in a plane at right angles to the vertical,`

a dragline passing around said sheave and having its two parts straddlingfthe boom, gde sheaves,

.Lacasse '4. In anexcavating machine of,4 the pulland means exterior of and carried bythe I m, for jsaid vdragline, sheaves having their-suman blocks' directif. opposite sides the upperven pivotedto vper handle, atfra'me on said support, a'-

sheave carried by said frame, a hoistingca- I ble haw'ng a` two-Kart hoist line connection with eachof the 's pivoted to the supporting platform a di per handle pivoted inte-malate itsends il) the 4lower end of said'handle', a ragline straddling the boom and connected Ato the '.dipper, an operating drum onf said supporting latform Yf or said dragline, a hoist- 1n rum on said-platform, and a hoisting ca le on said drum guided over-said auxiln.v the outer end of said boom, a di per on e. f

iary `frame andvoperatively connected Iwith the upper lend of the dipper handle.

9L In 'an excavating machine of the type described, the combination with a support, of a boom pivoted thereon, a diEper having e outer end its handle pivotallyjcarried at t .portion of said boom andl swinging toward theA same during digging, and means for controlling the movements ofthe boom,'and dipper, .said boom being cambered to increasethe working range ofthe dipper, the greater part of such camber'l ing .within va distance vfrom the outer end o the boom notA greater than the distance measured along a straight line from .the center of the pivotal j connection between the boom and the'dipper-'stick tothe cutting edge of the dipper. 10.v In an excavating machine of the ty described, the combination with'the frameL work of the machine, of' abooln pivoted thereon, a ldipper having its handle pivoted intermediate its .ends atthe outer end portion lof, said boom, and swinging toward the ciated with `the u per end of said handle vforj raising and owering the boom and swinging'said handle, 'a drag cable connected with the diEper, 'and cable connections for the'drag ca 105 4 boom during digging, a .hoisting cable assole between said framework `and the boom, one at a negligible distance fromthe boom .hin e and the other at a' substantial distance rom the boom hinge ltol facilitate the Working of the dipper in .different kindsof material.

ture, y

' PAULBURKE.

In testimony whereof, I'aiiix myjsigna 

